Q21.1
Atrial septal defect
Header / non-billable
Choose the additional character
Q21.1 needs more characters to be billable. Pick the specific code below.
- Q21.10Atrial septal defect, unspecifiedBillable
- Q21.11Secundum atrial septal defectBillable
- Q21.12Patent foramen ovaleBillable
- Q21.13Coronary sinus atrial septal defectBillable
- Q21.14Superior sinus venosus atrial septal defectBillable
- Q21.15Inferior sinus venosus atrial septal defectBillable
- Q21.16Sinus venosus atrial septal defect, unspecifiedBillable
- Q21.19Other specified atrial septal defectBillable
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
This code · Q21.1
Excludes 2
ostium primum atrial septal defect (type I) (Q21.20)
Inherited from Q21Congenital malformations of cardiac septa
Excludes 1
acquired cardiac septal defect (I51.0)
Inherited from chapter 17Congenital malformations, deformations and chromosomal abnormalities
Excludes 2
inborn errors of metabolism (E70-E88)
Note
Codes from this chapter are not for use on maternal records
Official Guidelines for Q21.1
FY 2026 ›Sections that reference Q21.1
Sections whose FY 2026 text names Q21.1, its Q21 category, or a range containing it — the chapter guidance above is the authoritative source.